Stirrup pump stops pumping at 50bar???????

[markmac]

My RWS Stirrup pump has just stopped working and I am not sure why

Used it this morning to fill my pcp pistol with no problems at all, had a plinking session in the garden then went to recharge it again just now and it locks up when I get to around 50 bar.Bled the line and tried again but got progressively harder to pump and locked up at 50bar again - couldn't lift the pump lever up or push it down. Felt like a hydraulic lock of air somewhere within the system.

Anyone had any similar issues or can advise what could be wrong?

A Parts diagram would be most welcome if anyone has one for a 2 stage stirrup pump

[Sv rider]

I have a hills pump don't know how similar to yours this is but when it happens to mine it's the non return valve that's sticking so because I have to strip it down to clean it I tend to send of for a service kit and kill two birds as to speak...

[markmac]

Thanks for your reply - Where is the non return valve located within the pump assembly?

[Sv rider]

Found a exploded diagram of a rws pump on Spares.bagnallandkirkwood.co.uk I think the non return valve is no6 on the diagram sorry I couldn't give you a better link to website ..

[markmac]

Thanks again for your help - I will check out the website

[Shed tuner]

small 3rd stage seal might have gone...

[angrybear]

Sounds like the non return between first & second stage has failed.

[Missed_dinner]

Mine stops working after bout 30-40 pumps!!!

Then after a couple of minutes I can carry on pumping.





Sorry I couldn't be of any help.